pkhuong / kismet-cache / 39

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readonly: new public interface for a stack of read-only cache dirs

When storing cache data in filesystem directories, it often makes
sense to pull from a few read-only directories, e.g., when migrating
from one cache scheme to another, or when reading from another
program's cache.

The `ReadOnlyCache` abstracts that process, while hiding the
difference in type between plain and sharded caches.

TESTED=new smoke test.

115 of 115 new or added lines in 1 file covered. (100.0%)

1008 of 1030 relevant lines covered (97.86%)

1.6 hits per line